<template>
  <div style="overflow: hidden">
    <div class="goods">
      <div class="menu-wrapper">
        <ul>
          <!--current-->
          <li class="menu-item" v-for="(good, index) in goods" :key="index"
              :class="{current: index===currentIndex}" @click="clickMenuItem(index)">
            <span class="text bottom-border-1px">
              <img class="icon" :src="good.icon" v-if="good.icon">
              {{good.name}}
            </span>
          </li>
        </ul>
      </div>
      <div class="foods-wrapper">
        <ul ref="foodsUl" class="foodsUl">
          <li class="food-list-hook" v-for="(good, index) in goods" :key="index">
            <h1 class="title">{{good.name}}</h1>
            <ul>
              <li class="food-item bottom-border-1px" v-for="(food, index) in good.foods"
                  :key="index" @click="showFood(food)">
                <div class="icon">
                  <img width="57" height="57" :src="food.icon">
                </div>
                <div class="content">
                  <h2 class="name">{{food.name}}</h2>
                  <p class="desc">{{food.description}}</p>
                  <div class="extra">
                    <span class="count">月售{{food.sellCount}}份</span>
                    <span>好评率{{food.rating}}%</span>
                  </div>
                  <div class="price">
                    <span class="now">￥{{food.price}}</span>
                    <span class="old" v-if="food.oldPrice">￥{{food.oldPrice}}</span>
                  </div>
                  <div class="cartcontrol-wrapper">
                    <CartControl :food="food"/>
                  </div>
                </div>
              </li>
            </ul>
          </li>
        </ul>
      </div>
      <ShopCart/>
    </div>
    <Food :food="showMyFood" ref="food"/>
  </div>
</template>


<script>
  import {mapState} from "vuex"
  import Food from "../../../components/Food/Food";
  import ShopCart from "../../../components/ShopCart/ShopCart";
  import CartControl from "../../../components/CartControl/CartControl";
  import BScroll from "better-scroll";

  export default {
    data() {
      return {
        tops: [],
        food: [],
        scrollY: "",
        showMyFood:""
      }
    },
    methods: {
      getScroll() {
        this.menuScroll = new BScroll(".menu-wrapper", {
          probeType: 2,
          click:true
        });
        this.foodsScroll = new BScroll(".foods-wrapper", {
          probeType: 2,
          click:true
        });
        this.foodsScroll.on("scroll", ({x, y}) => {
          // console.log(y);
          let scrollY = Math.abs(y);
          this.scrollY = scrollY;
        })
        this.foodsScroll.on("scrollEnd", ({x, y}) => {
          this.scrollY = Math.abs(y);
        })
      },
      _initFoods() {
        let top = 0;
        let tops = [];
        tops.push(top);
        let lis = this.$refs.foodsUl.children;
        Array.from(lis, (li, index) => {
          let liHeight = li.clientHeight;
          console.log(liHeight);
          top += liHeight;
          tops.push(top);
        })
        this.tops = tops;
        console.log(this.tops);
      },
      clickMenuItem(index) {
        let top=this.tops[index];
        this.scrollY=top;
        this.foodsScroll.scrollTo(0,-top,300)
      },
      showFood(food) {
        this.showMyFood=food;
        console.log(this.showMyFood)
        this.$refs.food.toggleShow()
      }
    },
    computed: {
      ...mapState(["goods"]),
      currentIndex() {
        let {tops, scrollY} = this;
        let index=tops.findIndex((item,index)=>{
           return scrollY>=tops[index]&&scrollY<tops[index+1]
        })
        return index;
      }
    },
    mounted() {
      this.$store.dispatch("getShopGoods", () => {
        this.$nextTick(() => {
          this.getScroll();
          this._initFoods();
        })
      });
    },
    components: {
      Food,
      ShopCart,
      CartControl
    }
  }
</script>

<style scoped lang="stylus">
  @import "../../../common/css/mixins.styl"
  .goods
    display: flex
    position: absolute
    top: 195px
    bottom: 46px
    width: 100%
    background: #fff;
    overflow: hidden

    .menu-wrapper
      flex: 0 0 80px
      width: 80px
      background: #f3f5f7

      .menu-item
        display: table
        height: 54px
        width: 56px
        padding: 0 12px
        line-height: 14px

        &.current
          position: relative
          z-index: 10
          margin-top: -1px
          background: #fff
          color: $green
          font-weight: 700

          .text
            border-none()

        .icon
          display: inline-block
          vertical-align: top
          width: 12px
          height: 12px
          margin-right: 2px
          background-size: 12px 12px
          background-repeat: no-repeat

        .text
          display: table-cell
          width: 56px
          vertical-align: middle
          bottom-border-1px(rgba(7, 17, 27, 0.1))
          font-size: 12px

    .foods-wrapper
      flex: 1

      .title
        padding-left: 14px
        height: 26px
        line-height: 26px
        border-left: 2px solid #d9dde1
        font-size: 12px
        color: rgb(147, 153, 159)
        background: #f3f5f7

      .food-item
        display: flex
        margin: 18px
        padding-bottom: 18px
        bottom-border-1px(rgba(7, 17, 27, 0.1))

        &:last-child
          border-none()
          margin-bottom: 0

        .icon
          flex: 0 0 57px
          margin-right: 10px

        .content
          flex: 1

          .name
            margin: 2px 0 8px 0
            height: 14px
            line-height: 14px
            font-size: 14px
            color: rgb(7, 17, 27)

          .desc, .extra
            line-height: 10px
            font-size: 10px
            color: rgb(147, 153, 159)

          .desc
            line-height: 12px
            margin-bottom: 8px

          .extra
            .count
              margin-right: 12px

          .price
            font-weight: 700
            line-height: 24px

            .now
              margin-right: 8px
              font-size: 14px
              color: rgb(240, 20, 20)

            .old
              text-decoration: line-through
              font-size: 10px
              color: rgb(147, 153, 159)

          .cartcontrol-wrapper
            position: absolute
            right: 0
            bottom: 12px
</style>
